Jaeger-LeCoultre’s Calibre 101 is a hand-wound mechanical movement launched in 1929 and identified by both the manufacture and the Science Museum Group as the smallest mechanical watch movement ever made. The movement itself measures 14 × 4.8 mm and is 3.4 mm thick; those are calibre dimensions, not the dimensions of a finished watch.
How small is Jaeger-LeCoultre Calibre 101?
Jaeger-LeCoultre gives the Calibre 101 dimensions as 14 × 4.8 mm, with a thickness of 3.4 mm, and counts 98 components. The miniature calibre was assembled by a select group of watchmakers. Its footprint helps explain why it could fit into jewellery watches, but a finished watch is larger: its case, dial and bracelet are separate from the movement.
These specifications appear in Jaeger-LeCoultre’s Calibre 101 video description.
Why is it called the smallest mechanical watch movement?
Jaeger-LeCoultre describes the calibre as the world’s smallest mechanical calibre. The Science Museum Group independently catalogues a 1929 Jaeger-LeCoultre 101 movement and calls it the smallest mechanical wristwatch movement ever made. These sources support the record claim; the distinction here is specifically for a mechanical watch movement, not every kind of watch component or complete watch.
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- Striking Women’s Watch: This mechanical watch with a distinctive 3D index dial inspired by steampunk design, blending vintage allure with modern luxury. Detailed exhibition case back,remarkable visual style. The crown is set with a sapphire, suitable for noble women to wear
- Precision in Motion: Powered by your wrist's natural movement, this self-winding watch requires no battery, ensuring consistent timekeeping. The option for manual winding adds a personalized touch, honoring traditional watchmaking techniques
- Exquisite Craftsmanship: Luxury elegant feminine women Rhinestone case Roman Number dial Self-Wind Mechanical watch with Leather Strap. Encased in high-hardness mineral glass. so it would be a perfect gift for ladies; the best Birthday, Valentine, Wedding, Anniversary, Christmas or New Year Gift
- Reliable Everyday Performance: With a 3ATM water resistance rating, this watch handles daily activities like hand-washing and minor splashes with ease. It's perfect for both casual and business settings, though not suited for water sports like diving or snorkeling
- Service: If you have any questions, please send an email to our after-sales team. Usually, we will reply to you ASAP and we will do our best to provide you with a good shopping experience
See Jaeger-LeCoultre’s history of the movement and the Science Museum Group’s catalogue entry.
When was Calibre 101 invented?
Jaeger-LeCoultre launched Calibre 101 in 1929, after developing the Duoplan movement in 1924. Duoplan’s use of two superposed planes helped the manufacture pursue miniaturisation while retaining usable precision. The 101 followed as part of the wider 1920s effort to make elegant, exceptionally small mechanical watches. The manufacture’s press material on miniaturisation places the calibre in that context.
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- ⌚【Mechanical Movement】: No need to worry about the battery is dead, but Manual SELF-WINDING! Notice! Since manual winding mechanical watches are operated manually, they can only last for a few hours after winding. It is recommended that you check the time frequently and wind up the chain (15-20 times) to avoid running or inaccurate time.
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What kind of movement is Calibre 101?
Calibre 101 is a hand-wound mechanical movement built for extreme miniaturisation, not a general-purpose modern wristwatch engine. Jaeger-LeCoultre developed it for very small, elegant watches, particularly designs where the movement could support a high-jewellery form. Its specialist purpose and tiny dimensions are central to its significance.
Which watches use Calibre 101?
The calibre has appeared in jewellery watches over its long history, and Jaeger-LeCoultre continues to present it in high-jewellery creations. The manufacture says Queen Elizabeth II wore a Calibre 101 watch at her 1953 coronation. Modern expressions include:
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- [Fashion Design] Synthetic sapphire mirror, unique ceramic stainless steel strap. The classic 3-pin design, pearl oyster dial and date display at 3 o'clock are more in line with modern women's pursuit of fashion.
- [Ladies Automatic Watch Machinery] No battery required. The watch is a balance wheel driven by the mainspring. After receiving the watch, please turn the crown clockwise 30-40 times. Wear it for 8-12 hours a day to have a sufficient power reserve. Allow the watch to maintain sufficient power. If you do not wear it for a long time, you need to wind it manually when you use it again.
- [Watch Function] Water-resistant to 164 feet (50 meters). Suitable for daily waterproofing. Under normal circumstances, it is suitable for swimming and bathing, but not suitable for snorkeling, diving and deep water related work.
- [Exquisite Gifts For Women] Whether for work, leisure or banquet, this watch can be matched. This watch is suitable as a gift for all business events, birthdays, Valentine's Day and unforgettable holidays.
- [JSDUN Professional Services]: We provide 30-day unreasonable return and lifetime warranty for automatic mechanical watches. If you encounter problems during the use of the watch, you can contact us through Amazon, and the professional after-sales team will provide you with services.
- 101 Secrets: a diamond-set secret watch with a concealed opening mechanism.
- 101 Feuille: a design that reinterprets a leaf-shaped cover.
These examples illustrate the movement’s role in watches designed as jewellery as well as timekeepers. Jaeger-LeCoultre discusses the coronation watch and these creations in its history material.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should collectors check when considering a Calibre 101 watch?
The calibre’s historical importance does not establish the condition, originality or value of any individual watch. Assess the specific piece rather than relying on the movement’s reputation alone:
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- Through long hours of glossy angled engraving, planning, design, precision machining and production processes made the stainless steel case and safety buckle has the characteristic of durability, and the buckle is convenient to put on and take off. Stainless steel or genuine leather strap with ergonomic design, the watch is incredibly comfortable to wear. Whether you are working for long hours or engaging in outdoor activities, it fits snugly on your wrist, providing you with the utmost comfort.
- Synthetic sapphire crystal mirror, the hardness is the second after the diamond, not afraid of syringes and breaking, high temperature resistance and super corrosion protection, making your watch more durable and resistant to scratches and refraction. 50M waterproof, perfect for all types of business, casual, indoor, outdoor activities or daily use. In daily life, you can wear it to wash your hands and get in the rain, but please do not wear your watch when swimming, diving or taking a hot bath.
- Watch is with calendar, tell your day and date anytime, anywhere, moreover it's with week and luminous function. See-through back cover allows you to observe the work of the movement at any time, feel the passage of time intuitively, and enjoy a different visual experience. With its classic design and dependable timekeeping, this watch makes an ideal gift for businessmen, professionals or anyone seeking an understated timepiece. This watch is suitable for all occasions, both formal and casual.
- Automatic self-wind movement, the watch guarantees accuracy and stability. With 21 synthetic gemstones stable bearings, it provides precise timekeeping and long time kinetic energy reserve. The model powered by the natural movement of your wrist, when you wear it, it will automatically continue to wind, also supports manually windings. Mechanical watch must be worn at least 8-10 hours a day, if it does not get enough energy, please wind the watch manually by rotating the crown about 30-40 laps.
- We have strict quality control standards to ensure every watch undergoes meticulous craftsmanship and rigorous testing. This watch with excellent durability, can accompany you for a long time. Do not use the watch at extremely hot or cold temperatures, which can damage the watch and shorten its lifespan. Keep the watch away from magnets as it can damage the movement. Please note that there may be color shifts as the display is different. If you have any question, please feel free to contact us.
- Movement identity and originality: request clear movement photographs and documentation that ties the calibre to the watch.
- Condition and service history: ask for dated service records and details of any replaced or repaired parts.
- Case and bracelet: confirm the materials and condition, since these are distinct from the movement’s dimensions.
- Provenance and paperwork: review available records and establish whether they correspond to the actual watch.
- Design and seller: distinguish an open-dial watch from a secret-watch or other jewellery format, and assess the seller’s reputation.
The cited sources document the calibre’s significance but do not establish current prices or authenticate specific listings. Those questions require item-level evidence.
Quick Recap
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- STEAMPUNK SKELETON DESIGN – Exposed gears and intricate mechanical movement visible through the dial create a striking vintage-industrial aesthetic. Rose-gold and silver two-tone case with Roman numerals adds timeless elegance. A conversation-starting timepiece that consistently draws compliments
- HAND-WIND MECHANICAL MOVEMENT – Powered by manual winding, no battery needed. Simply turn the crown 20-25 times for a full wind. Reliable analog movement keeps accurate time for daily wear. Embrace the traditional craftsmanship of mechanical watchmaking
- CLASSIC ROMAN NUMERAL DIAL – Bold Roman numerals and luminous hands ensure easy reading in any light. Exhibition case back reveals the intricate inner workings. 40mm case diameter with 12mm thickness offers substantial presence without being overly bulky
- COMFORTABLE BROWN LEATHER STRAP – Soft genuine leather band fits comfortably against the wrist. Adjustable buckle closure accommodates various wrist sizes. Versatile brown color pairs well with both casual and business attire
- VERSATILE ACCESSORY FOR ANY OCCASION – Transitions effortlessly from office to weekend. Suitable for work, travel, festivals, or everyday wear. A unique fashion statement that pairs well with suits or casual outfits. 3ATM splash-resistant for daily hand-washing and light rain
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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